The article itself has two conflicting reports; at least May 31st vs no statement as to an extended outage). Either way I do hope that Sony takes whatever time is needed to do things right.
As much as some users are freaking out as if a lack of PSN is on par with being in cocaine, heroin and meth withdrawals all at the same time and demanding the service be immediately restarted... Those same users would be even worse if it were brought back online and there were a second major breech.